Flat hinge



FIG. 1 is a top, right, front perspective view of a flat hinge showing my new design;

FIG. 2 is a top, right, rear perspective view thereof;

FIG. 3 is front side elevational view thereof;

FIG. 4 is a rear side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top plan view thereof. 

CLAIM The ornamental design for a flat hinge, as shown and described. 